Blar i Institutt for energiteknikk på forfatter "Fjellvåg, Helmer"
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Structural and magnetic properties of antifluorite-type Li<inf>5+x</inf>Fe<inf>1−x</inf>Co<inf>x</inf>O<inf>4</inf>
Thøgersen, Rasmus Vester; Fjellvåg, Asbjørn Slagtern; Fjellvåg, Øystein Slagtern; Fjellvåg, Helmer (Peer reviewed; Journal article, 2023) -
Structural and spectroscopic characterization of potassium fluoroborohydrides
Heyn, Richard H; Saldan, Ivan; Sørby, Magnus Helgerud; Frommen, Christoph; Arstad, Bjørnar; Bouzga, Aud Mjærum; Fjellvåg, Helmer; Hauback, Bjørn (Journal article; Peer reviewed, 2013)Mechanochemical reactions between KBH4 and KBF4 result in the formation of potassium fluoroborohydrides K(BHxF4−x) (x = 0–4), as determined by 11B and 19F solid state NMR. The materials maintain the cubic KBH4 structure. ... -
Synthesis, crystal structure, and thermal properties of the first mixed-metal and anion-substituted rare earth borohydride LiCe(BH4)3Cl
Frommen, Christoph; Sørby, Magnus Helgerud; Ravindran, Ponniah; Vajeeston, Ponniah; Fjellvåg, Helmer; Hauback, Bjørn (Journal article; Peer reviewed, 2011) -
Thermal stability of photovoltaic a-Si:H determined by neutron reflectometry
Qviller, Atle Jorstad; Dennison, A.J.C.; Haug, Halvard; You, Chang Chuan; Hasle, Ida Margrete; Østreng, Erik; Fjellvåg, Helmer; Vorobiev, A.; Hjorvarsson, B; Marstein, Erik Stensrud; Frommen, Christoph; Hauback, Bjørn (Journal article; Peer reviewed, 2014) -
Tuning the Magnetically Segregated Nanolayering in Mn–Ni–As Intermetallics
Gonano, Bruno Raymond Gino; Fjellvåg, Øystein; Steciuk, Gwladys; Guillou, Francois; Saha, Dipankar; Pelloquin, Denis; Fjellvåg, Helmer (Peer reviewed; Journal article, 2021) -
Understanding Capacity Fading of MgH2 Conversion-Type Anodes via Structural Morphology Changes and Electrochemical Impedance
El-Kharbachi, Abdelouahab; Hu, Yang; Sørby, Magnus Helgerud; Vullum, Per Erik; Mæhlen, Jan Petter; Fjellvåg, Helmer; Hauback, Bjørn (Journal article; Peer reviewed, 2018) -
Understanding the (De)Sodiation Mechanisms in Na‐Based Batteries through Operando X‐Ray Methods
Brennhagen, Anders; Cavallo, Carmen; Wragg, David; Sottmann, Jonas; Koposov, Alexey; Fjellvåg, Helmer (Journal article, 2021)Progress in the field of Na‐based batteries strongly relies on the development of new advanced materials. However, one of the main challenges of implementing new electrode materials is the understanding of their mechanisms ... -
Unraveling the (De)sodiation Mechanisms of BiFeO<inf>3</inf> at a High Rate with Operando XRD
Brennhagen, Anders; Skautvedt, Casper; Cavallo, Carmen; Wragg, David Stephen; Koposov, Alexey; Sjåstad, Anja Olafsen; Fjellvåg, Helmer (Peer reviewed; Journal article, 2024)Development of new anode materials for Na-ion batteries strongly depends on a detailed understanding of their cycling mechanism. Due to instrumental limitations, the majority of mechanistic studies focus on operando ...